注 类似地，求极限lim_(xto0)[(1)/(xint_(0)^xtan t^2dt)-(1)/(xint_(0)^xsin t^2dt)].

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[2019数学二](13)已知函数f(x)=xint_(1)^x(sin t^2)/(t)dt,则int_(0)^1f(x)dx=____[2019数学二](1

注 类似地，求极限lim_(xto0)(ln(1+x)ln(1-x)-ln(1-x^2))/(x^4).注 类似地，求极限$\lim_{x\to0}\frac{

注 类似地，求极限lim_(xto0)(ln(1+x)ln(1-x)-ln(1-x^2))/(x^4).注 类似地，求极限$\lim_{x\to0}\frac{